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I do residential split systems. Same issues. The compressor comes with its oil. Then if it's low or flat, I have to pull a vacuum in the system and it has to hold vac for like 30 min and not raise back up. Then a scale is used to weigh the charge being added. Vapor only to big pipe or suction (or compressor will be ruined) and liquid on the small pipe (liquid line). It can only be "topped off" when it's hot outside and the AC is running and working. Then check output air temp at vents and suction temp plus the suction side pressure based on a T&P chart. When output air is about 40* you're there.
When you top off it has typically enough oil to replace a leak in the can but if you lost a lot of oil it must be checked and replaced.
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Last edited by Timco; 05-31-2016 at 04:04 AM.
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